What is this number in expanded form? 8.21 800 + 20 + 1

8 + 0.2 + 0.1

8 + 0.2 + 0.01

8 + 2 + 1

answerthe vertex form

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

what's the question?

step-by-step explanation:

there is no question.

i would you but i don't under stand the qustion

step-by-step explanation: